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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7414541d5b797c179bc673b8784fe6f787505eb8639f5b7abb70ee578e8314' 
  AND token = 'cZw4o4CDcvDMcqy5R0/5BYAHCpAzOTugBOe18mA1YKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}